Which of the following is used to study the arrangement of particles in crystal lattices?
Alpha-particles
Beta-particles
Gamma-rays
X-rays
Which of the following shows that air is a mixture?
I. It has varied composition from place to place. II. Its constituents can be separated by physical means. III. It contains unreactive noble gases.
I and II only
II and III only
I and III only
I, II and III
The chemicals used to soften hard water involve the addition of
insoluble sodium compounds forming soluble calcium and magnesium ions
soluble sodium compounds forming soluble calcium and magnesium ions
soluble sodium compounds forming insoluble precipitates of calcium and magnesium ions
insoluble precipitates of calcium and magnesium ions
Chlorination of water for town supply is carried out to
make the water colourless
remove germs from the water
make the water tasteful
remove odour from the water
The solubilities of different solutes in a given solvent can be compared by
plotting their solubility curves on separate axes
plotting their solubility curves on the same axes
plotting some curves on the x-axis and others on the y-axis
plotting their solubility curves on the x-axis only
